Answer:
Attractive woman is the stressor
Racing heart is the stress reaction
Explanation:
Anything that causes stress, or tension is a stressor. To deal with the stress, your body will react. In this case, approaching the attractive woman is stressing Desmond out, so she is a stressor. The stress reaction would be the racing heart, which occurs because of the sudden release of hormones in the body. This is your body's way of preparing you to deal with what is causing your stress.
